Java versus Kotlin continued...

The Kotlin language has plenty of new syntax that follow parallels I other newer development language. For example, we can use var and val keywords where var is used for mutable properties and val is used for read-only properties. The getters and setters are provided by default 

Kotlin classes have primary and secondary constructors. The primary constructor does not have any code but may have decorations, visibility modifiers and type parameters.  Code can be placed inside the initializer blocks. The secondary constructors have to delegate to the primary constructor usually as the first statement so that the initializer block gets executed before the implementation. 

Kotlin allows implementations to be delegated via delegation pattern that replaces implementation inheritance with zero boilerplate code.  A derived class can implement an interface by delegating all of its public members to a specified object. This is independent from overrides. 

Type inference for variables and property types is automatic. New symbols, methods, keywords and constants make it very easy to declare and use variables. 

Slight modification of a class does not require a new subclass. Instead, we can use object expressions and object declarations.  Object expressions take an object parameter of an anonymous class usually derived from some type or types and overrides the methods associated with that type or types. Object declarations are used with singletons where the declaration is much simpler than in other languages. It uses the object keyword followed by the class name and the implementation.